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Main features :
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CSD 3 measures sunshine duration. Sunshine duration is defined by WMO as the time during which the direct solar radiation exceeds the level of 120 W/m².
It has no moving parts and uses 3 photo-diodes with specially designed diffusers to make an analogue calculation of when it is sunny. The output is switched high or low to indicate sunny or non-sunny conditions. The calculated direct irradiance value is also available. CSD 3 operates from 12 VDC power and has built-in heaters to dissipate rain, snow and frost. These are normally switched externally but an optional internal thermostat control is available.
The humidity indicator shows clearly when a change of drying cartridge is necessary. There is a waterproof plug-and-socket cable connection for easy installation and servicing. The large screw-on drying cartridge allows an exchange at extended intervals.
Specifications
| Spectral range (overall) | 400 to 1100 nm |
| Operational temperature range | -40°C to +70°C |
| Sunshine signal | 1 ±0,1 V (direct radiation > 120 W/m²) |
| Accuracy | > 90% (monthly sunshine hours) / > 90% (direct signal for clear sky) |
| Analogue output signal | 1 mV/Wm² |
| Non-stability (change/year) | < 2 % |
| Temperature response | < 0,1 % |
| Response time | < 1 ms |
| Power supply | 12 VDC |
